UER-2000 YE-220

1. FEATURES

UER-2000（YE-220）is the etching resist for pattern formation by screen printing.

-Excellent Stripping.

-Excellent printing performance.

2. GENERAL SPECIFICATION

Main Agent	YE-220	REMARK
Color	BLUE
Viscosity	200 PS ± 5% 25℃ 65RH
T.I. Value	1.5-1.8
Pigment	0.9%	Weight Percent
Curability	Good
Pencil Hardness	H	Pencil Method
Adhesion	100/100	Tape Method
Shelf Life*	6 Months after manufacturing	Below 25℃ in dark room

*: Stored in cool and dark place at less than 25℃.

3. PROCESS

A) Surface Preparation

Before printing, Oil and Fat, Oxidation and other foreign matters remains on P.C.B.

must be removed completely. Because, these contamination shall deteriorate such properties like as adhesion after cured. After treated in chemical cleaner, abundant water cleaning is necessary, Because of surface activator compounded in the cleaner may remain on P.C.B. and it shall also be one cause to deteriorate adhesion.

B) Environmental Working Condition

- Air conditioning

- No direct Sun-shines

- Yellow lamps

C) Viscosity Adjustment

Upon requested, Viscosity is adjustable at a proper level in range of 150 Ps.

Basically, no necessary to dilute;

If necessary, REDUCED is available;

Max, volume of REDUCED added is limited below 2% by weight in total;

Note, for dilution, any Solvent is not applicable.

D) Screen Printing

a. Screen Material:

Polyester monofilament fabricated in bias at 250-300 Mesh-count/inch .

b. Emulsion Coating:

A dry thickness coated at 0.010-0.015mm.

c. Sqeegee Rubber:

An Urethane Rubber, Hardness at 70℃.

E) Screen Wash-up and cleaning

Either of such solvents like as

-Acetic Ethyl Ether (Ethyl Acetate)

-Acetic Buthyl Ether (Buthyl Acetate)

-Buthyl Cellosolve….mostly recommendable

-Cellosolve Acetate

-Methyl Cellosolve

Any of Aromatic and/or Chloride solvent is not applicable.

F) Curing

Type of UV lamps	Power	Number of lamps	Conveyor speed
High Pressure Mercury-vapor lamp	80w/cm	3 Lamps	4m/min
Metal-Halide lamp	80w/cm	3 Lamps	5m/min
	120w/cm	3 Lamps	6m/min

G) Etching

Cupric chloride of Ferric chloride

H) Stripping

1-3% by weight of caustic soda(NaOH) at the temperature of 40-45℃.

4. SHELF LIFE

6 months from Date of Manufacture

Date of manufacture is appeared as production

Lot number marked on each labels: M000114 = Jan. 14, 2000

First 6 digits shows year, Month and Day

5. STORAGE CONDITION

Store in cool and dark condition at less than 25℃.